These two statements, to my eyes, seem to do the same thing but you say they give differing results. What's missing between the two aside from the fact you marked a partition active in diskpart?

Hi mate, you've misunderstood Chappies instructions slightly that's all.......both UEFI and BIOS bootable USB refers to the diskpart method below in his instructions.
only Bios bootable USB refers to the instructions below that in his list and those are the diskpart instructions where the difference is an NTFS format which only works in a BIOS boot and not in a UEFI boot

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